220-1201 Practice Question: A technician is repairing a tablet that has a…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  The digitizer is not compatible with the tablet model.

  Why it's wrong here

  Digitizer incompatibility typically manifests as a complete lack of touch response, erratic or ghost touches, or incorrect input registration across the entire screen, often accompanied by driver errors if the system attempts to recognize it. While this could cause no touch, a technician usually orders the correct, model-specific replacement part, making a physical connection issue far more probable after a repair. A loose flex cable is a common oversight during reassembly, whereas incompatibility implies a fundamental mismatch in hardware or firmware.

• ✓

  The digitizer flex cable is not fully seated in the connector.

  Why this is correct

  A digitizer flex cable that is not fully seated in its ZIF (Zero Insertion Force) connector will fail to establish proper electrical contact, preventing the transmission of touch input signals to the tablet's main logic board. While the LCD panel may function perfectly, displaying images, the lack of a complete connection means the touch controller cannot receive data from the digitizer. Reseating the cable firmly into its connector is a primary troubleshooting step to restore touch functionality.

• ✗

  The LCD panel was damaged during the repair.

  Why it's wrong here

  The LCD panel is responsible solely for displaying visual output, and its functionality is distinct from the digitizer, which handles touch input. Since the question implies the display is working, the LCD panel itself is clearly not damaged. A damaged LCD would manifest as visual artifacts, dead pixels, or a completely blank screen, none of which are indicated as the problem when only touch input is failing.

• ✗

  The tablet's touch controller needs to be calibrated.

  Why it's wrong here

  Touch controller calibration is a software-level adjustment process used to fine-tune the accuracy and responsiveness of an already functional digitizer. It corrects minor discrepancies between where a user touches the screen and where the system registers the input. However, calibration cannot resolve a fundamental hardware connection issue where no touch input is being registered at all, as the prerequisite for calibration is a working data path from the digitizer to the controller.

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